Mohammad Kamalpouradib; Vahid Rouhi; Saadollah Houshmand; Abdolrahman Mohammadkhani; Hamid Zargari
Abstract
Pollen storage could facilitate the date palm hand pollination through saving time and space. The main concern is maintaining pollen viability, which is greatly cultivar dependent and is influenced by storage condition. In this study, to address this issue, the effects of cultivar, storage ...
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Pollen storage could facilitate the date palm hand pollination through saving time and space. The main concern is maintaining pollen viability, which is greatly cultivar dependent and is influenced by storage condition. In this study, to address this issue, the effects of cultivar, storage temperature, and time on pollen germination were investigated. A factorial experiment was laid out in a completely randomized design with three replicates using four cultivars ‘Kazeroon (7013)’, ‘Lar (7035)’, ‘Darab (7016)’ and ‘Qyr-va Karzin (7021)’, four storage temperatures (RT (20 ± 5), 4, -20 and -80°C) and six storage periods (60, 120, 150, 180, 210 and 375 days). Anova of data showed significant effects of variety, storage temperature, storage time and their interactions on pollen germination. The pollen germination rate increased with decreasing temperature. When pollens were stored for up to 150 days, the germination rates of all varieties initially increased then decreased. Overall, the optimum temperature for preserving pollen grains of tested cultivars is -80°C and the highest pollen grain longevity is related to ‘Qyr-va Karzin (7021)’ after one year.
Roghayeh Aminian; Shahram Mohammadi deh cheshme; Saadollah Houshmand; Mahmoud Khodambashi; Karim Nozad
Volume 13, Issue 2 , March 2012, , Pages 13-25
Abstract
This study was conducted to determine the effects of stomatal size and frequency on stomatal conductance, photosynthesis rate and yield, and to locate the genes controlling these traits. Therefore, substitution lines series of ‘Timstein’ (Tim) into genetic background of ‘Chinese Spring’ ...
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This study was conducted to determine the effects of stomatal size and frequency on stomatal conductance, photosynthesis rate and yield, and to locate the genes controlling these traits. Therefore, substitution lines series of ‘Timstein’ (Tim) into genetic background of ‘Chinese Spring’ (CS) were tested in a completely randomized block design with three replications under two normal and water stress conditions in Shahrekord University research farm. Stress condition was started at elongation stage and irrigation periods were scheduled based on pre-determined ‘Growth Degree Day’ (GDD) during the length of stress period. Significant differences were found among substitution lines in terms of stomatal frequency, stomatal size, stomatal conductance, photosynthetic rate and yield. The significant correlation was found between the yield with stomatal size (r = 0.450**) and stomatal frequency (r = 0.461**) in stress and non-stress condition, respectively. In addition, there were significant correlation between yield with photosynthetic rate (r = 0.556** in stress condition and r = 0.482** in non-stress condition) and stomatal conductance (r = 0.247** in stress condition and r = 0.457** in non-stress condition). Based on the obtained results, it can be concluded that role of group B chromosomes was more prominent than the other two groups.